Buttonhole-sewing machine.



G. s. HILL.- BUTTDNHOLE szwme momma APPLICATION TILED KQY. 12, 1912. 1,063,795. Patented June 73, 1913.

2 sums-SHEET 1.

G. S. HILL.

BUTTONHOLE SEWING MACHINE.

APPLICATION FILED NOV. 12, 1912.

1,063,795. Patented June 3, 1913.

2 SHEETS-SHEET Z.

' UNITED STATES PATENT OFFICE.

GEORGE S. HILL, OF STRAFFORD, NEW HAIEPSHIRE, SSIGNOR TO UNITED SHOE MACHINERY COMPANY, OF PATERSON, NEW JERSEY, A CORPORATION OF NEW JERSEY.

BUTTON HOLE-SEWING MACHINE.

Specification of Letters Patent.

. Patented June 3, 1913.

Application filed November 12, 1912. Serial N 0. 730,865.

To all whom it may concern:

Be it known that I, Gnoncn S. HILL, a citizen of the United States, residing at Strafiord,.in the county of Strafiord and State 01".. New, Hampshire, have invented certain new and useful Improvements in Buttonhole-Scwing Machines; and I do hereby declare the'iollowi to be a full, clear, and exact description :f the invention, such as will enable othcrsskilled in the m to which it apperta'ins to make and use the same.

he invention relates to buttonhole sewing machines of that class in which a work holding clamp and stitch forming mechanism are relatively rotated in sewing about one or both ends of the buttonhole.

The object of the invention is to provide a novel and improved mechanism for effecting the relative rotation of the work clamp and sewing mechanism which will operate smoothly and in an efiicient and reliable manner when the machine is runat a high rate of speed. V

- With this object in view the invention comprises the features of construction and combinations of parts hereinafter described and setfiorth in the claims.

The features of the invention will be readi ly understood from an inspection of theaccompanying drawings and the following detailed description of the mechanism illustmted therein.

, In the drawings, Figure 1 is a sectional elevation showing so much of a buttonhole sewing machine as is necessary to illustrate .tl'fcgapplicat'on of the present invention thenetd and 2 and 3 are detailplan views showing the devices for rotating the stitch fiorming mechanism.

In the machine illustrated in the drawings work'is carried inza work clamp which is moved longitudinally and laterally during the sewing of a buttonhole, and the relative rotation of the work clamp and stitch forming mechanism to sew about the ends of the Buttonhole, and properly position thestitohes along the sides, is efl'ected by a rotation of the stitch forming mechanism.

work clamping devices comprise work 59 snpp'o'nting plates 1 and cooperating clampiagjaws 2 which are. carried by arms 3 pivotally supported upon the supporting jointed The clamping jaws are actuated b armsd a; nook shaft 5 which is V 155 the] carrying upon a carrier frame 16 .wluch lever 6 through. a lug 7 which engages a screw 8 carried by an arm 9 which is secured to the rock shaft. The butonhole is cut by a cutter 10 secured on the front end of the cutter lever 6 and operated by a cam 11 which is carried by a cam gear 12 and is] arranged to engage the rear end of the cutter lever. When the cutter lever isoperated it closes the work clamp, and the clamp is then latched in position by latching devices indicated at 13 in Fig. 1. The latchin devices are released to allow the work camp to open when the clamp is returned to cutting position after the sewing of the buttonhoe by a releasing pin 14 the upper end of which is arranged to engage a, cam 15 so mounted on the frame that it may yield to allow the passage of the releasing pin during the forward movement of the work clamp. l I The work clamping devices are carried .is' supported in suitable guides in the Inachi 'e frame, and is provided near its center with a; fulcrum stud l7 engaging a block 18 which is guided ina longitudinal slot 19 in the machine frame. The upper end of the fulcrum stud carries a roll engaging acam groove inftl e under surface of the cam gear 12. This cam groove is shaped to give the desired 10 gitudinal movements to theclam carriix. Proper lateral movements are imparted lilo the clamp carrier during the sewing of ,the; buttonhole by a cam groove formed in the upper surface of agear 20, and arranged to engage a roll on one end of a lever 21. The other end of the lever 21 carries a stud 22 engaging a block 23 which slides in a longitudinal slot 24 formed in the rear end of the 1 clamp carrier.

The stitch forming devices a. straight-eye-pointed upper needle 25 arranged to pass through the .work'at a certain distance from the edge of the buttonhole, a curved-.eye-pointed under needle 26 arranged to pass through'the buttonhole slit, and a coiiperating looper 27. -The up er needle .251 secured to the lower end 0? a hollow needle bar 28 whichflismounted to reciprocate through a sleeve29 and an upper bearing 30. The needle bar is connect ed with the sleeve by a key and slot so that the bar will rotate with the sleeve while bein free to reciprocate vertically through it. e s ve 29- is mounted to turn in a uniform speed.

cam ranged that the stitch bearing 31, and carries a wheel 32 connected through an endless driving band 33 with a similar wheel 34 secured to the upper end of a vertical shaft 35. The band 33 is provided with lugs 36 adapted to engage holes in the wheels 32 and 34, and the band passes over an idler pulley-37 which may be adjusted to properly tension the band. The under needle and looper are carried upon a turret 38 which is mounted in bearings formed in the turret bracket '39, and is provided at its lower end with a wheel 40 similar to the wheel 32. The wheel 40 is connected through a driving band 41 with a similar wheel 42 secured to the lower end of the shaft 35. The band 41 is similar in construction to the band 3.3, and passes over an idle pulley 43, by which its tension may be adjusted. 1

"During the sewing of each but-tonhole'the shaft 35 is turned through a complete revolution, and through the bands and wheels described, turns the stitch forming mechanism through a complete revolution.-

the machine shown the rotation of the shaft 35bit the: stitch-forming mechanism is always in the same direction, the parts being turned rotation after rotation during'the sewing of successive buttonholes. The shaft and the stitch forming mechanism are thus driven from the rotary'g'e'arfltl'throu h an arm- 44,- one end of whichis pivota y supported upon a stud or .crankpin" 45 se curedin theunder side of the gear, and the other end of which-is rovided with a slot 46 extending radially om the axis of the pivot. An arm 47 is secured to the shaft 35,-and is conne'cted with the arm 44 by a stud 48 carrying\ a pivot block 49 which t e slot 46 and is free to has a sliding fit in turn on thest-ud. The. arm 44 carries aroll 50' which travels in a cam groove 51 formed in' a disk 52 which is secured in a fixed bracket. The roll 50 isarranged to the rear ofthestud-45 which carries the arm 44, so that the roll is draw'nalong' the cam groove by the rotary travel of the stud.

During the operation of the stitch forming mechanism the' driving. gear 20 is rotated through a single revolution and at a I The arms 44 and 47 and the sliding connections between the arms serve to positively and continuously connect thegearand the shaft 35, and the stationary gr0ove-5l is-so roportioned and arorming mechanism is held stationary or moved: at varying speeds during the sewing about the .buttonhole,

according-tenths partpf the buttonhole at which thestitc formingT'inechanism is oper-.

and arranged that the firststitch in the buttonhole is formed at the end of the buttonhole slit, and the last which the stitch is completed in the same needle hole in which the first stitch was taken.

The position of the parts when the machine is started and stopped is indicated in cam roll 50 moves in a part 53 ofthe. cam groove, which is so shaped that no rotary movement is imparted to the stitch forming .mechanism. After the first stitch has been 7 tonhole, and 18 again if any turning of the stitch forming mocha. nism in sewing along the straigh -side' .of

along the opposite straight side of menusmovement 1: imparted to the stitch forming mechanism is proper position next buttonhole.

therefore stopped in tively and uniformly. controlled while the actuating mechanism-is operating at 'rate of speed, rangement of and the construction and arthe connections between the? a cam groove having easy curves for con- -While the invention has out undue wearwor friction.

The main camgear and the driving gear. 20 are both driven through tion during the sewing of each buttonhole, and the driving mechanism for the gears is so constructed and operated that the gear 20 rotates only during the sewing of the buttonhole, while the gear' dependently at the beginning and at the end ofthe cycle of'operations performed by. the 1 machine to actuate the cutter and to move the work from cutting to sewing position before thesewing begins,

the buttonhole'is completed.-

I and described as embodied in a machine 111:.

Fig. 2. At the beginning of the sewing the formed the roll travels in a part of'- the comparatively rapid rate durp i omparatively little the buttonhole, is accelerated so that the'- In sewing mechanism is turned at a coanpara; tively rapid rate in sewing about thejeyeo'f the buttonhole, is again retarded in sefi wi'ng accelerated in-passmg fromvthe side to the end andlsewing across!- the end of the buttonhole. Asthe 'ing mechanism: during the last retracting. 1 movement of the needle, and the'stitch formto begin theisewingfof the of the stitch forming'mechanism is po v driving gear and shaft 35 enable the use of 0 trolling the movements of the arm '44'withasingle revolu- 12 is driven in- 123 and fromsewing 125 hack to cutting position after the sewing of In the'niachine illustrated the-mechanisms L, are so timed been illustrated relative rotation between Work clamp and stitch forming mechanism is effected by rotation of the stitch forming mechanism, and in which the stitch forming mechanism is rotated rotation after rotation in the same direction in sewing about successive buttonholes, it will be understood that the invention is not limited in its application to a machine in which the relative rotation is thus efi'ected, or in which there is no reverse rotation of the stitch forming mechanism, but may be embodied with ,advantage in other constructions.

aving explained the nature and object of the invent-ion, and specifically described one form of machine in which it may be embodied, what is claimed is 1. A buttonhole sewin machine, havin in combination, stitch Forming and wort holding mechanisms, mechanism for relatively rotating the work holding and stitch forming mechanisms to sew about a buttonhole comprising a rotary driving member, an arm pivoted to the driving member, a driven shaft provided with an arm, a sliding connection between the arms, and a cam acting on the pivoted arm to vary the motion transmitted to the shaft.

2. A buttonhole sewing machine, having, in combination, stitch forming and work holding mechanisms, mechanismv for ,rela tively rotating the work holding the stitch forming mechanisms to sew about a buttonhole comprising a driven shaft, a rotary driving member, an arm secured to the shaft, an arm pivoted to the driving memher, a radial slot in one of the arms, a stud on the other arm engaging the slot, and a cam acting on the pivoted arm tovary the motion transmitted to the shaft.

3. A buttonhole sewing machine, having,

in combination, stitch forming and work holding mecha'nisms, mechanism for relatively rotating the Work holding and stitch forming mechanisms to sew about a button hole comprising'a driven shaft, an arm secured to the shaft, a concentric rotary driving member, an arm pivoted to the driving member, a radial slot in the pivoted arm, a stud on the other arm carrying a pivot b ock sliding in the slot, a roll carried by the pivoted arm, and a stationary cam along which the roll travels for varying the motion transmitted through arms.

4. A buttonhole sewing machine, having, in combination, upper and under thread handling mechanism, rotary supports for said mechanism, a shaft connected to rotate the supports, a rotating driving member, an arm pivoted on the driving member, an arm secured to the shaft, a sliding connection between the arms, and a cam acting on the pivoted arm for transmitted to the supports.

5. A buttonhole sewing machine, having, in combination, stitch forming and work holding mechanisms, mechanism for relatively rotating the work holding and stitch forming mechanisms to sew about a buttonhole comprising a shaft, an arm secured to the shaft, a rotary driver, an arm pivoted to the driver, a sliding connection between the arms, a roll on the pivoted arm arranged at the rear of the pivot, and a stationary cam along which the roll travels for varying the motion transmitted to the shaft.

GEORGE S. HILL. Witnesses:

CHESTER E. Roonns, RUTH E. VARD.

Copies of this patent may be obtained for five cents each, by addressing the "Commissioner of Patents, Washington, D. C.

the connected varying the motion 

